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How to use MockMaker class of test package

Best Mockito-kotlin code snippet using test.MockMaker

UnitTestImplTest.kt

Source:UnitTestImplTest.kt

...138            DescriptorProto {139                options = DescriptorProtos.MessageOptions.newBuilder().setMapEntry(false).build()140            }141        )142        val mockMaker = UnitTestImpl.DefaultMockMaker143        assertThat(mockMaker.getMockValue(types, null)).isEqualTo("mock()")144        val fieldInfo: ProtoFieldInfo = mock {145            on { field } doReturn FieldDescriptorProto {146                type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_MESSAGE147                typeName = ".my.test.type"148            }149        }150        assertThat(mockMaker.getMockValue(types, fieldInfo)).isEqualTo("mock()")151    }152    @Test153    fun `can generate sensible enum values`() {154        val enumDescriptor: DescriptorProtos.EnumDescriptorProto = mock {155            on { valueList } doReturn listOf(156                DescriptorProtos.EnumValueDescriptorProto.newBuilder()157                    .setName("THE_ONE")158                    .build(),159                DescriptorProtos.EnumValueDescriptorProto.newBuilder()160                    .setName("TWO")161                    .build()162            )163        }164        whenever(types.hasProtoEnumDescriptor(eq(".my.test.type"))).doReturn(true)165        whenever(types.getProtoEnumDescriptor(eq(".my.test.type"))).doReturn(enumDescriptor)166        whenever(types.getKotlinType(eq(".my.test.type"))).doReturn(ClassName("my.test", "Type"))167        val mockMaker = UnitTestImpl.DefaultMockMaker168        val fieldInfo: ProtoFieldInfo = mock {169            on { field } doReturn FieldDescriptorProto { typeName = ".my.test.type" }170        }171        assertThat(mockMaker.getMockValue(types, fieldInfo)).isEqualTo("Type.THE_ONE")172    }173    @Test174    fun `can generate sensible primitive values`() {175        whenever(types.hasProtoEnumDescriptor(any())).doReturn(false)176        val mockMaker = UnitTestImpl.DefaultMockMaker177        assertMockValueForPrimitive(178            mockMaker,179            "\"hi there!\"",180            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_STRING }181        )182        assertMockValueForPrimitive(183            mockMaker,184            "true",185            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_BOOL }186        )187        assertMockValueForPrimitive(188            mockMaker,189            "2.0",190            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_DOUBLE }191        )192        assertMockValueForPrimitive(193            mockMaker,194            "4.0",195            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_FLOAT }196        )197        assertMockValueForPrimitive(198            mockMaker,199            "2",200            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT32 },201            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_UINT32 },202            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_FIXED32 },203            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_SFIXED32 },204            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_SINT32 }205        )206        assertMockValueForPrimitive(207            mockMaker,208            "400L",209            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT64 },210            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_UINT64 },211            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_FIXED64 },212            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_SFIXED64 },213            { type = DescriptorProtos.FieldDescriptorProto.Type.TYPE_SINT64 }214        )215    }216    private fun assertMockValueForPrimitive(217        mockMaker: MockMaker,218        expectedValue: String,219        vararg builders: DescriptorProtos.FieldDescriptorProto.Builder.() -> Unit220    ) {221        for (builder in builders) {222            val descriptor = DescriptorProtos.FieldDescriptorProto.newBuilder()223            descriptor.apply(builder)224            assertThat(mockMaker.getMockValue(types, mock {225                on { field } doReturn descriptor.build()226            })).isEqualTo(expectedValue)227        }228    }229}...

CustomMockMaker.kt

Source:CustomMockMaker.kt

...14 * limitations under the License.15 */16package androidx.core.util.mockito17import android.os.Build18import com.android.dx.mockito.DexmakerMockMaker19import com.android.dx.mockito.inline.InlineDexmakerMockMaker20import org.mockito.invocation.MockHandler21import org.mockito.mock.MockCreationSettings22import org.mockito.plugins.InlineMockMaker23import org.mockito.plugins.MockMaker24/**25 * There is no official supported method for mixing dexmaker-mockito with dexmaker-mockito-inline,26 * so this has to be done manually.27 *28 * Inside the build.gradle, dexmaker-mockito is taken first and preferred, and this custom29 * implementation is responsible for delegating to the inline variant should the regular variant30 * fall to instantiate a mock.31 *32 * This allows Mockito to mock final classes on test run on API 28+ devices, while still33 * functioning for normal non-final mocks API <28.34 *35 * This class is placed in the core sources since the use case is rather unique to36 * [androidx.core.content.pm.PackageInfoCompatHasSignaturesTest], and other testing solutions should37 * be considered before using this in other modules.38 */39class CustomMockMaker : InlineMockMaker {40    companion object {41        private val MOCK_MAKERS = mutableListOf<MockMaker>(DexmakerMockMaker()).apply {42            // Inline only works on API 28+43            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {44                this += InlineDexmakerMockMaker()45            }46        }47    }48    override fun <T> createMock(settings: MockCreationSettings<T>, handler: MockHandler<*>): T? {49        var lastException: Exception? = null50        MOCK_MAKERS51            .filter { it.isTypeMockable(settings.typeToMock).mockable() }52            .forEach {53                val mock = try {54                    it.createMock(settings, handler)55                } catch (e: Exception) {56                    lastException = e57                    null58                }59                if (mock != null) {60                    return mock61                }62            }63        lastException?.let { throw it }64        return null65    }66    override fun getHandler(mock: Any?): MockHandler<*>? {67        MOCK_MAKERS.forEach {68            val handler = it.getHandler(mock)69            if (handler != null) {70                return handler71            }72        }73        return null74    }75    override fun resetMock(76        mock: Any?,77        newHandler: MockHandler<*>?,78        settings: MockCreationSettings<*>?79    ) {80        MOCK_MAKERS.forEach {81            it.resetMock(mock, newHandler, settings)82        }83    }84    override fun isTypeMockable(type: Class<*>?): MockMaker.TypeMockability? {85        MOCK_MAKERS.forEachIndexed { index, mockMaker ->86            val mockability = mockMaker.isTypeMockable(type)87            // Prefer the first mockable instance, or the last one available88            if (mockability.mockable() || index == MOCK_MAKERS.size - 1) {89                return mockability90            }91        }92        return null93    }94    override fun clearMock(mock: Any?) {95        MOCK_MAKERS.forEach {96            (it as? InlineMockMaker)?.clearMock(mock)97        }98    }99    override fun clearAllMocks() {100        MOCK_MAKERS.forEach {101            (it as? InlineMockMaker)?.clearAllMocks()102        }103    }104}...

2016-9f30dd7283f90d50dc9a3d1e.awesome.kts

Source:2016-9f30dd7283f90d50dc9a3d1e.awesome.kts

...36    assertEquals(300.0, amount)37}38```39but on running it, Mockito would complain indicating that it cannot mock a class/method that is final.40## MockMaker41[Mockito 2](http://mockito.org/) solves this. With the recent [release of version 2](https://github.com/mockito/mockito/wiki/What's-new-in-Mockito-2), one of the big changes is the ability to mock the un-mockable. In other words, you can mock final classes in Java and consequently all classes and member functions in Kotlin.42In order to take advantage of this feature, you write your code in exactly the same way you would for mocking an open class/function. However, you need to perform an additional step which basically consists in creating a file named `org.mockito.plugins.MockMaker` and placing this under the `resources/mockito-extensions` directory in your test folder[1].43The file contains a single line:44```45mock-maker-inline46```47![Mockito Resource Folder](http://hadihariri.com/images/mockito-1.png)  48If youâre using Gradle, you can also have it [generate the file for you.](https://github.com/hhariri/mockito-sample/blob/master/build.gradle#L16). You can download the [sample project Iâve created from GitHub](https://github.com/hhariri/mockito-sample/)49Finally, a big kudos to [Rafael](https://twitter.com/rafaelcodes) for his work in making this possible!50[1] This feature is still new and plans are to make it easier to configure as they receive feedback on its usage.51"""52Article(53  title = "Mocking Kotlin with Mockito",54  url = "http://hadihariri.com/2016/10/04/Mocking-Kotlin-With-Mockito/",55  categories = listOf(56    "Kotlin",...

DependencyPatterns.kt

Source:DependencyPatterns.kt

...53val mockitoPatterns = listOf(MOCKITO_JAR_PATTERN, MOCKITO_MVN_PATTERN)54val MOCKITO_BASIC_MODULE_PATTERN = Regex("mockito-core")55val mockitoModulePatterns = listOf(MOCKITO_BASIC_MODULE_PATTERN)56const val MOCKITO_EXTENSIONS_STORAGE = "mockito-extensions"57const val MOCKITO_MOCKMAKER_FILE_NAME = "org.mockito.plugins.MockMaker"58val MOCKITO_EXTENSIONS_FILE_CONTENT = listOf("mock-maker-inline")...

OMDBAppTest.kt

Source:OMDBAppTest.kt

...22    fun setup() {23        MockitoAnnotations.initMocks(this);24        //dataStore = Mockito.mock(OMDBContentDataStore::class.java)25        /*26            java.lang.AbstractMethodError: org.powermock.api.mockito.internal.mockmaker.PowerMockMaker.isTypeMockable(Ljava/lang/Class;)Lorg/mockito/plugins/MockMaker$TypeMockability;27	        at org.mockito.internal.util.MockUtil.typeMockabilityOf(MockUtil.java:29)28	        at org.mockito.internal.util.MockCreationValidator.validateType(MockCreationValidator.java:22)29	        at org.mockito.internal.creation.MockSettingsImpl.validatedSettings(MockSettingsImpl.java:186)30         */31    }32    @Mock33    private lateinit var dataStore: OMDBContentDataStore34    @Mock35    private lateinit var repository: OMDBContentRepository36    @Mock37    private lateinit var useCase: GetContentsUseCase<Map<String, String>>38    private fun handleContentsFound(contents: List<Content?>) {39        this.contents = contents.toMutableList()40    }...

NoteListPresenterTest.kt

Source:NoteListPresenterTest.kt

...14    private val note = Note(1, "Title", "Body")15    private val notes: List<Note> = listOf(note)16    private val scope: CoroutineScope = TestCoroutineScope()17    /**18     * ADR # 17. Testing: use Mockito MockMaker for mocking in unit tests19     */20    private val view: NoteListViewContainer = mock()21    private val navigation: NoteListNavigation = mock()22    private val service: NoteService = mock()23    private val sut = NoteListPresenter(view, navigation, service, scope)24    @Test25    fun `after initialization note will be loaded`() = runBlocking {26        whenever(service.getNotes()).thenReturn(notes)27        sut.start()28        verify(view).setLoading(true)29        verify(service).getNotes()30        verify(view).showNotes(notes)31    }32    @Test...

UtilityTest.kt

Source:UtilityTest.kt

...16    fun test_functionUnderTest() {17        /**18         * ì½íë¦°ìì ëª¨ë  í´ëì¤ê° ê¸°ë³¸ì ì¼ë¡ final19         * ê°ì  ë°©ë² : open classë¡ ë§ë¤ê±°ë ìë ë°©ë²20         * > org.mockito.plugins.MockMaker21         */22        val classUnderTest = mock(Utility::class.java)23        classUnderTest.functionUnderTest()24        verify(classUnderTest).functionUnderTest() // ë©ìëê° í¸ì¶ ëìëì§25    }26    @Test27    fun testSharedPreference() {28        val sharedPreference = mock(SharedPreferences::class.java)29        `when`(sharedPreference.getInt("random_int", -1))30                .thenReturn(1)31                .thenReturn(123)32        assertEquals(sharedPreference.getInt("random_int", -1), 1)33        assertEquals(sharedPreference.getInt("random_int", -1), 123)34    }...

ContainerTest_Final.kt

Source:ContainerTest_Final.kt

...8import org.mockito.Mock9import org.mockito.junit.MockitoJUnitRunner10/**11 * In order for this to work, rename file in test/resources/mockito-extensions from12 * 'MockMakerToRename' to 'org.mockito13 * .plugins.MockMaker'. However, this slows down running of unit tests by about 5 seconds14 *15 * Shows how even mocking of a final class 'DependencyImpl' is possible with MockMaker, which was16 * added to in Mockito 217 */18@RunWith(MockitoJUnitRunner::class)19class ContainerTest_Final {20    @Mock lateinit var dependency : DependencyImpl21    @Mock lateinit var dataObject : DataObject22    lateinit var container : Container23    @Before fun setup() {24        container = Container(dependency)25    }26    @Test27    fun mockingSimpleFinalClassWorks() {28        //WHEN29        container.doTheThing(4)...

MockMaker

Using AI Code Generation

1@RunWith(MockitoJUnitRunner.class)2public class MyTest {3    private MyService myService;4    private MyController myController;5    public void test() {6        when(myService.getSomething()).thenReturn("something");7        assertThat(myController.getSomething()).isEqualTo("something");8    }9}

MockMaker

Using AI Code Generation

1	Employee employee;2	public void testCalculateGrossSalary() {3		Mockito.when(employee.getBasicSalary()).thenReturn(10000.0);4		double grossSalary = employeeService.calculateGrossSalary(employee);5		assertEquals(13000.0, grossSalary, 0.02);6	}7	public void testCalculateNetSalary() {8		Mockito.when(employee.getBasicSalary()).thenReturn(10000.0);9		Mockito.when(employee.getMedical()).thenReturn(500.0);10		double netSalary = employeeService.calculateNetSalary(employee);11		assertEquals(12450.0, netSalary, 0.02);12	}13}

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